| 摘要 |
A printed wiring board includes: an anode pattern electrically connected to an anode of a laser diode; and a cathode pattern arranged to oppose the anode pattern and electrically connected to a cathode of the laser diode, the anode pattern and the cathode pattern being in shapes having such parts that a distance between the anode pattern and the cathode pattern opposed to each other is a first distance, and such parts that a distance between the anode pattern and the cathode pattern opposed to each other is a second distance shorter than the first distance, at least such parts that the distance between the anode pattern and the cathode pattern opposed to each other is the second distance being short-circuited by solder in a case where the laser diode is protected from an electrostatic discharge.
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